Dam Rehabilitation and Fish Lift Design at the Pejepscot Hydroelectric Project

by Michael F. Dumont, Acres Intl Corp, United States,
Allen G. Corwin, Acres Intl Corp, United States,
Peter S. Foote, Acres Intl Corp, United States,

Document Type: Proceeding Paper

Part of: Waterpower '89


The rehabilitation work on the existing rockfilled timber crib dam comprised an assessment of the existing dam stability; analysis of the existing hydraulic conditions to establish the reasons for repeated flood damage to the existing concrete apron slab; and development of a revised design for the dam which would allow an increase in the permanent crest level of two feet. In addition, five hydraulically-operated steel crest gates 96 feet long and 3 feet high were installed to increase the available gross head from 21 feet to 24 feet without impacting upstream flood levels. The Pejepscot fish lift was designed to handle a maximum capacity of 3,400 American shad per hour, using a conventional braille and hopper arrangement.

Subject Headings: Concrete dams | Dams | Rehabilitation | Fish management | Hydro power | Hydraulic design | Gates (hydraulic) | Earthfill dams

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